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Stop Mongoose from creating _id property for sub-document array items
...ose");
var subSchema = mongoose.Schema({
//your subschema content
},{ _id : false });
var schema = mongoose.Schema({
// schema content
subSchemaCollection : [subSchema]
});
var model = mongoose.model('tablename', schema);
...
How to clear the interpreter console?
...s file in your python search path:
# wiper.py
class Wipe(object):
def __repr__(self):
return '\n'*1000
wipe = Wipe()
Then you can do this from the interpreter all you like :)
>>> from wiper import wipe
>>> wipe
>>> wipe
>>> wipe
...
How do I invert BooleanToVisibilityConverter?
...r<Visibility>
{
public BooleanToVisibilityConverter() :
base(Visibility.Visible, Visibility.Collapsed) {}
}
Finally, this is how you could use BooleanToVisibilityConverter above in XAML and configure it to, for example, use Collapsed for true and Visible for false:
<Applicat...
What's the difference between echo, print, and print_r in PHP?
I use echo and print_r much, and almost never use print .
11 Answers
11
...
What are the differences between the threading and multiprocessing modules?
...nd a thread pool like this:
with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
executor.submit(job, argument)
executor.map(some_function, collection_of_independent_things)
# ...
You can even get the results of those jobs and pass them on to further jobs, wait for t...
Original purpose of ? [closed]
...how to modify it via dev tools, but could have bad implications on the database if modification of those values corrupts other data (for instance, if you're storing the primary key reference and it's manually changed by the user).
– Brett84c
Jun 16 '16 at 15:53...
Empty set literal?
...>> print(s)
set()
this is basically a more condensed way of doing {_ for _ in ()}, but, don't do this.
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Default implementation for Object.GetHashCode()
...these instances are stored in a hash set or a hash table.
[...] Reflection-based implementation is slow. Very slow.
[...] Both ValueType.Equals and ValueType.GetHashCode have a special optimization. If a type does not have "pointers" and is properly packed [...] then more optimal versions are used: ...
warning about too many open figures
...) will remove a specific figure instance from the pylab state machine (plt._pylab_helpers.Gcf) and allow it to be garbage collected.
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Comparing strings with == which are declared final in Java
...llowing byte code:
Code:
0: ldc #2; //String str
2: astore_1
3: ldc #3; //String ing
5: astore_2
6: new #4; //class java/lang/StringBuilder
9: dup
10: invokespecial #5; //Method java/lang/StringBuilder."<init>":()V
13: aload_1
14: invo...